Does your daughter have any special needs?
What has the doctor said about this? The going to the potty while asleep seems like a physical thing.. That is why I wonder if the doctor needs to send her to a specialist.
If once it has been determined there is not a problem then you can deal with this in a punitive way.
Have any of her teachers had to deal with this?
I am not sure how you can help her if she is not embarrassed. Does this happen when she is around her friends?
Has this happened at a sleep over?
What would she feel like if her friends knew about this?
Have you asked her?
I can maybe understand maybe she is having so much fun she does not want to stop.. but she has to learn this is a priority. 7 year old's do not do this. They are big kids now.
If there is no physical reason for this. I would have a talk with her this weekend and explain that this is no longer acceptable.
From now on you are going to start reminding her to go to the potty every 20 minutes. She is to stop what she is doing and try to go. No whining, no fit throwing. This needs to be a priority.
She needs to on her own clean up her messes..
The only way you can intervene is when you have to to the laundry and you spot clean.. This way she will have the full responsibility for this.
If it were me, I would no longer enable this behavior. I would explain until she can get this under control for at least a month without these messes.. No more extras.. No movies, no friends over no her going over to friends home.. whatever her deal is. In our daughters case.. it would be no library ir book store.. (this was like a death sentence to her)